Abstract
In order to explore the changes in the community structure of Lake Balaton in response to progressive eutrophication, the historic plankton database (1965–1990) was analysed, using the Zipf-Mandelbrot (ZM) model of dominance and diversity. Our results confirm differences in community organisation between the less eutrophic eastern (Siofok) basin and the near hypertrophie western (Keszthely) basin: the ZM model shows there to be greater influence of the traditional limiting environmental factors in the less eutrophic basin. There is also a greater evenness in the total biomass in the less eutrophic basin, determined by the variability in the environmental control applied.
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